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Finding the Fourth Proportional to 931.32, 1,396.77 and 281.91

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Solution

The fourth proportional to 931.32, 1,396.77 and 281.91 is: 422.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.32 : 1,396.77 = 281.91 : x
  2. Step 2: Convert to fraction form
    931.32/1,396.77 = 281.91/x
  3. Step 3: Cross multiply
    931.32x = 1,396.77 × 281.91
  4. Step 4: Simplify right side
    931.32x = 393,763.43
  5. Step 5: Solve for x
    x = 393,763.43/931.32
  6. Step 6: Final answer
    x = 422.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.